Hi Jorge,

···<date: 2013-11-27, Wednesday>···<from: DesdeChaves>···

> I try make a table with some random numbers but I found a problem with this
> code:
> 
> 
> \starttext
> \ctxluacode{v=math.random(400,600)/10;context("%0.1f",v) ;}
> 
> \bTABLE
> \bTR\bTD Distance (cm) \eTD\bTD $\Delta t$ (s) \eTD\eTR
> \bTR\bTD[nr=3]  \ctxluacode{v=math.random(400,600)/10;context("%0.1f",v) ;}
>  \eTD\bTD t1 \eTD\eTR
> \bTR\bTD t2 \eTD\eTR
> \bTR\bTD t3 \eTD\eTR
> \eTABLE
> 
> 
> \stoptext
> 
> \ctxluacode{v=math.random(400,600)/10;context("%0.1f",v) ;}   don't work
> inside the bTABLE environment.

just wrap the code in a macro. Lua code needs a different catcode
regime and expansion rules that don’t cooperate well with the
table scanner. E.g.

    \startluacode
      local mathrandom = math.random
      local context    = context
      document.get_random_number = function ()
        context ("%0.1f", mathrandom (400, 600) / 10)
      end
    \stopluacode

    \def \getrandomnumber {\ctxluacode {document.get_random_number ()}}

    \starttext
      \bTABLE
        \bTR \bTD Distance (cm)          \eTD \bTD $\Delta t$ (s) \eTD \eTR
        \bTR \bTD[nr=3] \getrandomnumber \eTD \bTD t1             \eTD \eTR
        \bTR                                  \bTD t2             \eTD \eTR
        \bTR                                  \bTD t3             \eTD \eTR
      \eTABLE
    \stoptext


Hth,
Philipp